Process of distillation.



Patented Mar. 29, 1910.

H. 0. V. BERGSTROM.

PROCESS or DISTILLATION.

APPLIUATIDN FILED DEG. 23,1905.

Jn vn tor if 0. C fiergstrdm By 1113 Attorney;

mfg w M,

Witnesses Q invented certain new UNITED STATES PATENT oEEioE.

HILDING OLOF VIDAR BERGSTRfiM, OF S'I'OGKHOLM, SWEDEN.

PROCESS or ms'rILLATIoN.

To all whom it may concern:

Be it known that I, H'ineiNG OLoF VIDAR BERcsTaoM, engineer, a subject of the King of Sweden, residing in J ernkontoret, Kungstrltdgt'irdsgatan 4, Stockholm, Sweden, have and useful Improvements in Processes of Distillation, of which the following is a specification.

The present invention relates to a method for boiling, eva 'ioration or distillation of the condensed products of distillation produced in charring or dry distillation of wood, peat and the like organic matters according to which method the heat of the vapors or gaseous products of distillation generated during the charring or distilling is utilized for said purpose. A

The object of the invention to utilize in a more economic manner than heretofore the heat of the vapors or gaseous products of distillation generated through dry distillation, carbonizing or charring of wood, peat and the like organic matters. The vapors or gases that issue from the kiln or retort where the charring process going on contain, however. more heat than is theoretically iecessar for the distillation of the raw r'roligneous acid emanating from the same kiln or retort. In order to utilize the heat of said vap'oiz o gases, the volatile products generated in the kiln t where the charring or distillation p irress is going on. are, according to the present invention. passed through a heating element of suitable construction arranged in a distilling vessel or a boiler con -iui..g raw ryroligncous acid or other condensed or liquid products resulting from the distillation of wood, peat or similar organic inatters. In the said vessel or boiler the distillation is carried out with the aid of vacuum.

In order to make the invention clearerit is described in the' following manner with reference to the accompanying drawin forming part of this specification, oil whic 1 drawing Figure 1 is a sectional view of a suitable apparatus for carrying out the method or process, and Fig. 2 is a seetionalview of a somewhat. modified form of the said apparatus.

a is the kiln or retort in which the charring or dry distillation of wood, peat or the like is carried out. I) is a 'pipe or passage through which the vapors or gaseous prod ucts generated during the charring process Specification of Letters Patent.

Application filed December 23,1905. Serial No. 293,055.

Patented Mar. 29, 1910.

pass out from said kiln or retort into a heatmg element a of any suitable construction,- arranged in a vacuum boiler, indicated by c. In this apparatus or vessel the liquid to be distilled, consisting, for instance, of the raw pyroligneous acid received from an earlier charring or carbonizing process, is introduced. This apparatus or vessel is as usual provided with a discharge pipe d, provided with a valve or the like, for drawing off those matters contained in the raw pyroligneous acid; as, for instance, tar and, the like, that are not evaporated through the influcnce of the tem erature and vacuum that exist in the said distilling apparatus. Furthermore, the said apparatus is provided with a pipe or passage 6 for drawing off the gases or vapors generated in the said upparatus. In connection with this pipe e there is also arranged an apparatus f of suitable construction for separating liquid particles mechanically entrained by the vapors or gases generated in the distilling apparatus. The said gases or vapors generated in the vacuum boiler pass through said pipe 0 into a closed receptacle 9, C011- taining milk of lime or other substances suitable for absorbing or combining with the acetic acid. The acid products are thus absorbed onretained in the said receptacle I but the rest of the gases or vapors pass from the receptacle 1 through a pipe g, to a condenser /Z.., and i. e products condensed in said condenser, consisting chiefly of diluted wood spirits and aceton. are then collected in a closed receptacle L connected with the condenser b. v means of a pipe w. The gases that are not condensable pass out from this latter receptacle through the pipe I, which pipe is connected with a suction pump L, which thus exhausts the gases from the distillation apparatus throu h the pipes t, in and if, so that the distilling process is going on under vacuum in said apparatus.

The gases and vapors generated in the Kiln or retort a during the charring process while passing through the heating element .9

give of? heat to-said element and part of them are thereby condensed, while on the other hand by means of the heat thus "lYli off the liquid to be distilled in the distilling ap aratns 0 becomes heated and evaporates or oils. The products flowing through the heating element, as well as those which are condensed therein and the uncondensed gases flow from the heating element through the pipe or passage Z to the condenser m, I

thc heat of thc sages where they are inserted may at wil be opened or closed. In these receptacles 0, o", the several condensed rate by reason of their di erentspecific weight. A part of said products consists of 1products sepa- 1 raw pyroligncous acid, which, on account of 1 its specific weight, becomes separated in the said receptacles from 011 and tar and such substances. "lhis pyroligncous acid is carried up from the receptacle by suitable means, for instance, from the receptacle 0 throu 'h the pipe p, and introduced into the.

distil mg apparatus or vacuum boiler c, where it is (in the manner hereinbeforc stated, through theinfluence of the heat or the gaseous products of distillation issuing from the kiln or retort a, through the action o" the heating element 8) heated whereby a part of the said liquid is evaporated and the j vapors thus generated flow off through the pipe 0 and, as before stated, pass into the liquid, milk of lime or the like, contained in the receptacle 9, where the acetic acid is} united or combined with lime and a solution of acetate of lime formed. whilethe other I deusation of the products of (llSllllilllUn through the pipe 9' to the condenser 11. The 1 products flow on from the receptacle q products condensed in said condenser h are collected in the receptacle 2' and are treated uncoudcnsed products pass from this receppassing the hcating clcment oi" the boiler pass to the condenser and thcrc'i'roin tl: ]i|'()tlt|t'lr arc carricd (ill in the same manner as above stated with rel'crcncc to Fig. J. The gascous product. generated in the vacuum boiler r pass through the pipc y and the condenser h, from which latter the condcnscd produ ts passlhrough suitable pipw. (not shown.) whilc Ihc uncoudcnscd produ ts are drawn oil n nictlns oi the su tion pump 1''. It will be i'tutlll) .sccn that gas-cs and vapors is uing from the retort or kiln whcre the charring process going on. without departing tron the idea of this invention, ma also be utilizcd for the heating or distillation. of liquid products received from the charring process other than the raw pyroligneous acid. lhus,

for instance, it may be used for evaporation of solutions of calcium acetate, which is rcceired through absorption of the'acetic acid in the milk of lime. rectification of wood spirits, or distillations of oils. tar and other )roducts. resulting from charring or distil' lation of wood, peat or the like organic sub stances. which roducts for the said purpos are then iutrodiiccd into the vacuum boil or l'ioilers c.

By means of the present invention tl following advantages are gained over th. methods heretofore used. The fuel nccc sary for purification of the products of d. tillation is reduccd'about fifty er cent, and also the number of steam boi ers neeessa: may be reduced about fifty per cent. of who is necessary according to former methods. The quantity of water necessary for co issuing from the coating kiln or retort is reduced about seventy-five per cent. or more,

, depending on the manner 1H which the disfor the production of wood sp1rits,'and the 1 tacle through the pipe 1, which is, as above stated, connected with a suction pump. It is to be understood that the receptacle 1 may be omitted, in which case all condensable products, and also the acid products issuing from the essel 0 after passing the condenser h, are collected in the receptacle 2'.

'In the apparatus shown in Fig. 2 the reccptaclc isomittcd. In this form of the ap paratus a vacuum boiler 1', may be inter.- posed between the vacuum boiler c and "the condenser h in such a way that the steam or gases issuing from the vacuum boiler 0 pass through the heating element ofthe said \acuum boiler 1', whereby at least a part of said steam or gases are condensed, thereby giving ofi' their heat of condensation to said eating element, so that the solutions, consisting, for instance, of wood s irit or a solution of acetate of lime intro need in said vacuum boiler 'r, are distilled.

The gases that are not condensed when tillation is carried out. Although these ad vantages are gained. the cost of establishing or equipping a factory according to'thc present invention are considerably less tha the equipment of a factory of the same ca pacity according to former systems.

Having thus described my invention, I declare that what I claim is:

1. The process of ut lizing the heat from the vapors or gaseous products of the car bonizing or dry distillation of wood, peat and similar organic-materials, consisting in leading such vapors or gaseous products through the heating element of a vacuum boiler that contains the condensed or liquid products of such distillation, whereby the said liquid products are vaporized or have vapors driven ofi therefrom by the heat of the said gaseous products led through said heating element, While at the same time the said gaseous products become condensed, the teupon leading the products condensed in'the heating or conveying element to a. series of receptacles,'where the products will separate according to their specific weights, and leading the condensed products or solu tions from such receptacles into the said vacuum boiler for further distillation by the heat from the said heating element.

2. The process of utilizing the heat trom the vapors or gaseous products of the carbonizing or dry distillation of wood, peat and similar organic materials,- consisting in leading such vapors or gen-teemv products through the heating element of a vacuum boiler that contains the condensed or liquid pro'ducts of such distillation, whereby the said liquid products are vaporized or have vapors driven off therefrom by theheat ofthe said products led through said heating clei'nent, while at the same time the said products become condensed, thereupon leading the vapors and liquid products from the vacuum boiler into a vessel containing milk of lime or other suitable solution whereby the acid roducts are absorbed, and there upon leac ing the gases, not absorbed in the latter vcsselvinto a condenser to collect the remaining condensable products.

3-. 'Ilhe process of utilizing the heat from the vapors or gaseous products of the carbonizing or dry distillation of wood, peat and slmllar organic materials, consisting in leading such vapors or gaseous products thereupon leading theQvapors andv gaseous products from the vacuum boiler into a vessol containing milk of lime or other suitable solution whereby the acid products areab sorbed, and thereupon leading the gases not said gaseous absorbed in the latter vessel into a con-t bonizing' or dry distillation of wood, pcat and similar organic materials, consistii g in leading such vapors orgaseouspro acts through the heating element of a vacuum boiler that contains the condensed or liquid -p1'0dl1cls.uf suel1 distillatiou, whereby the said liquid products are vaporized or have vapors driven ofl therefrom by the heatof the said aseo'us products led through said heating e ement, while at the same time the )rod-ucts become condensed, thereupon leading the vapors and gaseous products enerated in the vacuum boiler through tlic heating element of another vacuum boiler containing condensed or liquid products of said distillation of wood, peat and the like, which are thereby heated or evaporated, thereupon leadin the vapors that are not condensed in the mating elementof the last. mentioned vacuum-boiler to a condenser to be condensed and col looted while the products condensed in said heating element are led oil and collected.

In witness whereof, I have hereunto set my hand in presence of two witnesses.

lllblllNG OLOF VIDAR BERGSTRtlM.

Witnesses AUG. I'IAGDIN, ALMA Pn'rmnsson. 

